package cn.edu.scau.cmi.yejiancong.composit;

import java.util.ArrayList;

public abstract class company {
	
	public abstract String toString();
	public abstract String getDept() ;
	public abstract void add(company cp) ;
	
	public abstract void remove(company cp) ;
	public abstract ArrayList<company> getList() ;
	public abstract company getChild(int index);
		
	
}
